Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Jul. 31, 2017	Oct. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 1,135,639	$ 1,068,428
Accumulated Amortization	887,304	801,767
Net Assets	248,335	266,661
Core/developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Assets	622,979	610,812
Accumulated Amortization	511,064	460,722
Net Assets	111,915	150,090
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Assets	276,704	235,997
Accumulated Amortization	160,188	139,932
Net Assets	116,516	96,065
Contract rights intangible
Finite-Lived Intangible Assets [Line Items]
Gross Assets	173,455	171,248
Accumulated Amortization	171,420	162,183
Net Assets	2,035	9,065
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Assets	25,129	20,729
Accumulated Amortization	16,556	13,821
Net Assets	8,573	6,908
In Process Research and Development
Finite-Lived Intangible Assets [Line Items]
Gross Assets	4,600
Accumulated Amortization	0
Net Assets	4,600
Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Gross Assets	32,772	29,642
Accumulated Amortization	28,076	25,109
Net Assets	$ 4,696	$ 4,533